x86_mem.c revision 106842
145405Smsmith/*- 245405Smsmith * Copyright (c) 1999 Michael Smith <msmith@freebsd.org> 345405Smsmith * All rights reserved. 445405Smsmith * 545405Smsmith * Redistribution and use in source and binary forms, with or without 645405Smsmith * modification, are permitted provided that the following conditions 745405Smsmith * are met: 845405Smsmith * 1. Redistributions of source code must retain the above copyright 945405Smsmith * notice, this list of conditions and the following disclaimer. 1045405Smsmith * 2. Redistributions in binary form must reproduce the above copyright 1145405Smsmith * notice, this list of conditions and the following disclaimer in the 1245405Smsmith * documentation and/or other materials provided with the distribution. 1345405Smsmith * 1445405Smsmith * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1545405Smsmith * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1645405Smsmith * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1745405Smsmith * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1845405Smsmith * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1945405Smsmith * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2045405Smsmith * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2145405Smsmith * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2245405Smsmith * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2345405Smsmith * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2445405Smsmith * SUCH DAMAGE. 2545405Smsmith * 2650477Speter * $FreeBSD: head/sys/i386/i386/i686_mem.c 106842 2002-11-13 09:37:43Z mdodd $ 2745405Smsmith */ 2845405Smsmith 2945405Smsmith#include <sys/param.h> 3045405Smsmith#include <sys/kernel.h> 3145405Smsmith#include <sys/systm.h> 3245405Smsmith#include <sys/malloc.h> 3345405Smsmith#include <sys/memrange.h> 3476078Sjhb#include <sys/smp.h> 35106842Smdodd#include <sys/sysctl.h> 3645405Smsmith 3745405Smsmith#include <machine/md_var.h> 3845405Smsmith#include <machine/specialreg.h> 3945405Smsmith 4045405Smsmith/* 4145405Smsmith * i686 memory range operations 4245405Smsmith * 4345405Smsmith * This code will probably be impenetrable without reference to the 4445405Smsmith * Intel Pentium Pro documentation. 4545405Smsmith */ 4645405Smsmith 4745405Smsmithstatic char *mem_owner_bios = "BIOS"; 4845405Smsmith 4945405Smsmith#define MR686_FIXMTRR (1<<0) 5045405Smsmith 5145405Smsmith#define mrwithin(mr, a) \ 5245405Smsmith (((a) >= (mr)->mr_base) && ((a) < ((mr)->mr_base + (mr)->mr_len))) 5345405Smsmith#define mroverlap(mra, mrb) \ 5445405Smsmith (mrwithin(mra, mrb->mr_base) || mrwithin(mrb, mra->mr_base)) 5545405Smsmith 5645405Smsmith#define mrvalid(base, len) \ 5745405Smsmith ((!(base & ((1 << 12) - 1))) && /* base is multiple of 4k */ \ 5845405Smsmith ((len) >= (1 << 12)) && /* length is >= 4k */ \ 5945405Smsmith powerof2((len)) && /* ... and power of two */ \ 6045405Smsmith !((base) & ((len) - 1))) /* range is not discontiuous */ 6145405Smsmith 6245405Smsmith#define mrcopyflags(curr, new) (((curr) & ~MDF_ATTRMASK) | ((new) & MDF_ATTRMASK)) 6345405Smsmith 64106842Smdoddstatic int mtrrs_disabled; 65106842SmdoddTUNABLE_INT("machdep.disable_mtrrs", &mtrrs_disabled); 66106842SmdoddSYSCTL_INT(_machdep, OID_AUTO, disable_mtrrs, CTLFLAG_RD, 67106842Smdodd &mtrrs_disabled, 0, "Disable i686 MTRRs."); 68106842Smdodd 6946215Smsmithstatic void i686_mrinit(struct mem_range_softc *sc); 7046215Smsmithstatic int i686_mrset(struct mem_range_softc *sc, 7146215Smsmith struct mem_range_desc *mrd, 7246215Smsmith int *arg); 7346215Smsmithstatic void i686_mrAPinit(struct mem_range_softc *sc); 7445405Smsmith 7545405Smsmithstatic struct mem_range_ops i686_mrops = { 7645405Smsmith i686_mrinit, 7746215Smsmith i686_mrset, 7846215Smsmith i686_mrAPinit 7945405Smsmith}; 8045405Smsmith 8146215Smsmith/* XXX for AP startup hook */ 8246215Smsmithstatic u_int64_t mtrrcap, mtrrdef; 8346215Smsmith 8445405Smsmithstatic struct mem_range_desc *mem_range_match(struct mem_range_softc *sc, 8545405Smsmith struct mem_range_desc *mrd); 8645405Smsmithstatic void i686_mrfetch(struct mem_range_softc *sc); 8745405Smsmithstatic int i686_mtrrtype(int flags); 8894683Sdwmalonestatic int i686_mrt2mtrr(int flags, int oldval); 8994683Sdwmalonestatic int i686_mtrrconflict(int flag1, int flag2); 9048925Smsmithstatic void i686_mrstore(struct mem_range_softc *sc); 9148925Smsmithstatic void i686_mrstoreone(void *arg); 9245405Smsmithstatic struct mem_range_desc *i686_mtrrfixsearch(struct mem_range_softc *sc, 9345405Smsmith u_int64_t addr); 9445405Smsmithstatic int i686_mrsetlow(struct mem_range_softc *sc, 9545405Smsmith struct mem_range_desc *mrd, 9645405Smsmith int *arg); 9745405Smsmithstatic int i686_mrsetvariable(struct mem_range_softc *sc, 9845405Smsmith struct mem_range_desc *mrd, 9945405Smsmith int *arg); 10045405Smsmith 10145405Smsmith/* i686 MTRR type to memory range type conversion */ 10245405Smsmithstatic int i686_mtrrtomrt[] = { 10345405Smsmith MDF_UNCACHEABLE, 10445405Smsmith MDF_WRITECOMBINE, 10594683Sdwmalone MDF_UNKNOWN, 10694683Sdwmalone MDF_UNKNOWN, 10745405Smsmith MDF_WRITETHROUGH, 10845405Smsmith MDF_WRITEPROTECT, 10945405Smsmith MDF_WRITEBACK 11045405Smsmith}; 11145405Smsmith 11294683Sdwmalone#define MTRRTOMRTLEN (sizeof(i686_mtrrtomrt) / sizeof(i686_mtrrtomrt[0])) 11394683Sdwmalone 11494683Sdwmalonestatic int 11594683Sdwmalonei686_mtrr2mrt(int val) { 11694683Sdwmalone if (val < 0 || val >= MTRRTOMRTLEN) 11794683Sdwmalone return MDF_UNKNOWN; 11894683Sdwmalone return i686_mtrrtomrt[val]; 11994683Sdwmalone} 12094683Sdwmalone 12148925Smsmith/* 12294683Sdwmalone * i686 MTRR conflicts. Writeback and uncachable may overlap. 12348925Smsmith */ 12494683Sdwmalonestatic int 12594683Sdwmalonei686_mtrrconflict(int flag1, int flag2) { 12694683Sdwmalone flag1 &= MDF_ATTRMASK; 12794683Sdwmalone flag2 &= MDF_ATTRMASK; 12894683Sdwmalone if (flag1 == flag2 || 12994683Sdwmalone (flag1 == MDF_WRITEBACK && flag2 == MDF_UNCACHEABLE) || 13094683Sdwmalone (flag2 == MDF_WRITEBACK && flag1 == MDF_UNCACHEABLE)) 13194683Sdwmalone return 0; 13294683Sdwmalone return 1; 13394683Sdwmalone} 13445405Smsmith 13545405Smsmith/* 13645405Smsmith * Look for an exactly-matching range. 13745405Smsmith */ 13845405Smsmithstatic struct mem_range_desc * 13945405Smsmithmem_range_match(struct mem_range_softc *sc, struct mem_range_desc *mrd) 14045405Smsmith{ 14145405Smsmith struct mem_range_desc *cand; 14245405Smsmith int i; 14345405Smsmith 14445405Smsmith for (i = 0, cand = sc->mr_desc; i < sc->mr_ndesc; i++, cand++) 14545405Smsmith if ((cand->mr_base == mrd->mr_base) && 14645405Smsmith (cand->mr_len == mrd->mr_len)) 14745405Smsmith return(cand); 14845405Smsmith return(NULL); 14945405Smsmith} 15045405Smsmith 15145405Smsmith/* 15245405Smsmith * Fetch the current mtrr settings from the current CPU (assumed to all 15345405Smsmith * be in sync in the SMP case). Note that if we are here, we assume 15445405Smsmith * that MTRRs are enabled, and we may or may not have fixed MTRRs. 15545405Smsmith */ 15645405Smsmithstatic void 15745405Smsmithi686_mrfetch(struct mem_range_softc *sc) 15845405Smsmith{ 15945405Smsmith struct mem_range_desc *mrd; 16045405Smsmith u_int64_t msrv; 16145405Smsmith int i, j, msr; 16245405Smsmith 16345405Smsmith mrd = sc->mr_desc; 16445405Smsmith 16545405Smsmith /* Get fixed-range MTRRs */ 16645405Smsmith if (sc->mr_cap & MR686_FIXMTRR) { 16745405Smsmith msr = MSR_MTRR64kBase; 16845405Smsmith for (i = 0; i < (MTRR_N64K / 8); i++, msr++) { 16945405Smsmith msrv = rdmsr(msr); 17045405Smsmith for (j = 0; j < 8; j++, mrd++) { 17145405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 17294683Sdwmalone i686_mtrr2mrt(msrv & 0xff) | 17345405Smsmith MDF_ACTIVE; 17445405Smsmith if (mrd->mr_owner[0] == 0) 17545405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 17645405Smsmith msrv = msrv >> 8; 17745405Smsmith } 17845405Smsmith } 17945405Smsmith msr = MSR_MTRR16kBase; 18045405Smsmith for (i = 0; i < (MTRR_N16K / 8); i++, msr++) { 18145405Smsmith msrv = rdmsr(msr); 18245405Smsmith for (j = 0; j < 8; j++, mrd++) { 18345405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 18494683Sdwmalone i686_mtrr2mrt(msrv & 0xff) | 18545405Smsmith MDF_ACTIVE; 18645405Smsmith if (mrd->mr_owner[0] == 0) 18745405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 18845405Smsmith msrv = msrv >> 8; 18945405Smsmith } 19045405Smsmith } 19145405Smsmith msr = MSR_MTRR4kBase; 19245405Smsmith for (i = 0; i < (MTRR_N4K / 8); i++, msr++) { 19345405Smsmith msrv = rdmsr(msr); 19445405Smsmith for (j = 0; j < 8; j++, mrd++) { 19545405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 19694683Sdwmalone i686_mtrr2mrt(msrv & 0xff) | 19745405Smsmith MDF_ACTIVE; 19845405Smsmith if (mrd->mr_owner[0] == 0) 19945405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 20045405Smsmith msrv = msrv >> 8; 20145405Smsmith } 20245405Smsmith } 20345405Smsmith } 20445405Smsmith 20545405Smsmith /* Get remainder which must be variable MTRRs */ 20645405Smsmith msr = MSR_MTRRVarBase; 20745405Smsmith for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) { 20845405Smsmith msrv = rdmsr(msr); 20945405Smsmith mrd->mr_flags = (mrd->mr_flags & ~MDF_ATTRMASK) | 21094683Sdwmalone i686_mtrr2mrt(msrv & 0xff); 21145405Smsmith mrd->mr_base = msrv & 0x0000000ffffff000LL; 21245405Smsmith msrv = rdmsr(msr + 1); 21345405Smsmith mrd->mr_flags = (msrv & 0x800) ? 21445405Smsmith (mrd->mr_flags | MDF_ACTIVE) : 21545405Smsmith (mrd->mr_flags & ~MDF_ACTIVE); 21645405Smsmith /* Compute the range from the mask. Ick. */ 21745405Smsmith mrd->mr_len = (~(msrv & 0x0000000ffffff000LL) & 0x0000000fffffffffLL) + 1; 21845405Smsmith if (!mrvalid(mrd->mr_base, mrd->mr_len)) 21945405Smsmith mrd->mr_flags |= MDF_BOGUS; 22045405Smsmith /* If unclaimed and active, must be the BIOS */ 22145405Smsmith if ((mrd->mr_flags & MDF_ACTIVE) && (mrd->mr_owner[0] == 0)) 22245405Smsmith strcpy(mrd->mr_owner, mem_owner_bios); 22345405Smsmith } 22445405Smsmith} 22545405Smsmith 22645405Smsmith/* 22745405Smsmith * Return the MTRR memory type matching a region's flags 22845405Smsmith */ 22945405Smsmithstatic int 23045405Smsmithi686_mtrrtype(int flags) 23145405Smsmith{ 23245405Smsmith int i; 23345405Smsmith 23445405Smsmith flags &= MDF_ATTRMASK; 23545405Smsmith 23694683Sdwmalone for (i = 0; i < MTRRTOMRTLEN; i++) { 23794683Sdwmalone if (i686_mtrrtomrt[i] == MDF_UNKNOWN) 23845405Smsmith continue; 23945405Smsmith if (flags == i686_mtrrtomrt[i]) 24045405Smsmith return(i); 24145405Smsmith } 24245405Smsmith return(-1); 24345405Smsmith} 24445405Smsmith 24594683Sdwmalonestatic int 24694683Sdwmalonei686_mrt2mtrr(int flags, int oldval) 24794683Sdwmalone{ 24894683Sdwmalone int val; 24994683Sdwmalone 25094683Sdwmalone if ((val = i686_mtrrtype(flags)) == -1) 25194683Sdwmalone return oldval & 0xff; 25294683Sdwmalone return val & 0xff; 25394683Sdwmalone} 25494683Sdwmalone 25545405Smsmith/* 25646215Smsmith * Update running CPU(s) MTRRs to match the ranges in the descriptor 25746215Smsmith * list. 25846215Smsmith * 25946215Smsmith * XXX Must be called with interrupts enabled. 26045405Smsmith */ 26148925Smsmithstatic void 26245405Smsmithi686_mrstore(struct mem_range_softc *sc) 26345405Smsmith{ 26445405Smsmith#ifdef SMP 26545405Smsmith /* 26675421Sjhb * We should use ipi_all_but_self() to call other CPUs into a 26745405Smsmith * locking gate, then call a target function to do this work. 26845405Smsmith * The "proper" solution involves a generalised locking gate 26945405Smsmith * implementation, not ready yet. 27045405Smsmith */ 27148925Smsmith smp_rendezvous(NULL, i686_mrstoreone, NULL, (void *)sc); 27248925Smsmith#else 27345405Smsmith disable_intr(); /* disable interrupts */ 27449421Smsmith i686_mrstoreone((void *)sc); 27546215Smsmith enable_intr(); 27648925Smsmith#endif 27746215Smsmith} 27846215Smsmith 27946215Smsmith/* 28046215Smsmith * Update the current CPU's MTRRs with those represented in the 28148925Smsmith * descriptor list. Note that we do this wholesale rather than 28248925Smsmith * just stuffing one entry; this is simpler (but slower, of course). 28346215Smsmith */ 28448925Smsmithstatic void 28548925Smsmithi686_mrstoreone(void *arg) 28646215Smsmith{ 28748925Smsmith struct mem_range_softc *sc = (struct mem_range_softc *)arg; 28846215Smsmith struct mem_range_desc *mrd; 28994683Sdwmalone u_int64_t omsrv, msrv; 29046215Smsmith int i, j, msr; 29146215Smsmith u_int cr4save; 29246215Smsmith 29348925Smsmith mrd = sc->mr_desc; 29446215Smsmith 29545405Smsmith cr4save = rcr4(); /* save cr4 */ 29645405Smsmith if (cr4save & CR4_PGE) 29745405Smsmith load_cr4(cr4save & ~CR4_PGE); 29845405Smsmith load_cr0((rcr0() & ~CR0_NW) | CR0_CD); /* disable caches (CD = 1, NW = 0) */ 29948925Smsmith wbinvd(); /* flush caches, TLBs */ 30045405Smsmith wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) & ~0x800); /* disable MTRRs (E = 0) */ 30145405Smsmith 30245405Smsmith /* Set fixed-range MTRRs */ 30345405Smsmith if (sc->mr_cap & MR686_FIXMTRR) { 30445405Smsmith msr = MSR_MTRR64kBase; 30545405Smsmith for (i = 0; i < (MTRR_N64K / 8); i++, msr++) { 30645405Smsmith msrv = 0; 30794683Sdwmalone omsrv = rdmsr(msr); 30845405Smsmith for (j = 7; j >= 0; j--) { 30945405Smsmith msrv = msrv << 8; 31094683Sdwmalone msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); 31145405Smsmith } 31245405Smsmith wrmsr(msr, msrv); 31345405Smsmith mrd += 8; 31445405Smsmith } 31545405Smsmith msr = MSR_MTRR16kBase; 31645405Smsmith for (i = 0; i < (MTRR_N16K / 8); i++, msr++) { 31745405Smsmith msrv = 0; 31894683Sdwmalone omsrv = rdmsr(msr); 31945405Smsmith for (j = 7; j >= 0; j--) { 32045405Smsmith msrv = msrv << 8; 32194683Sdwmalone msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); 32245405Smsmith } 32345405Smsmith wrmsr(msr, msrv); 32445405Smsmith mrd += 8; 32545405Smsmith } 32645405Smsmith msr = MSR_MTRR4kBase; 32745405Smsmith for (i = 0; i < (MTRR_N4K / 8); i++, msr++) { 32845405Smsmith msrv = 0; 32994683Sdwmalone omsrv = rdmsr(msr); 33045405Smsmith for (j = 7; j >= 0; j--) { 33145405Smsmith msrv = msrv << 8; 33294683Sdwmalone msrv |= i686_mrt2mtrr((mrd + j)->mr_flags, omsrv >> (j*8)); 33345405Smsmith } 33445405Smsmith wrmsr(msr, msrv); 33545405Smsmith mrd += 8; 33645405Smsmith } 33745405Smsmith } 33845405Smsmith 33945405Smsmith /* Set remainder which must be variable MTRRs */ 34045405Smsmith msr = MSR_MTRRVarBase; 34145405Smsmith for (; (mrd - sc->mr_desc) < sc->mr_ndesc; msr += 2, mrd++) { 34245405Smsmith /* base/type register */ 34394683Sdwmalone omsrv = rdmsr(msr); 34445405Smsmith if (mrd->mr_flags & MDF_ACTIVE) { 34545405Smsmith msrv = mrd->mr_base & 0x0000000ffffff000LL; 34694683Sdwmalone msrv |= i686_mrt2mtrr(mrd->mr_flags, omsrv); 34745405Smsmith } else { 34845405Smsmith msrv = 0; 34945405Smsmith } 35045405Smsmith wrmsr(msr, msrv); 35145405Smsmith 35245405Smsmith /* mask/active register */ 35345405Smsmith if (mrd->mr_flags & MDF_ACTIVE) { 35445405Smsmith msrv = 0x800 | (~(mrd->mr_len - 1) & 0x0000000ffffff000LL); 35545405Smsmith } else { 35645405Smsmith msrv = 0; 35745405Smsmith } 35845405Smsmith wrmsr(msr + 1, msrv); 35945405Smsmith } 36048925Smsmith wbinvd(); /* flush caches, TLBs */ 36145405Smsmith wrmsr(MSR_MTRRdefType, rdmsr(MSR_MTRRdefType) | 0x800); /* restore MTRR state */ 36245405Smsmith load_cr0(rcr0() & ~(CR0_CD | CR0_NW)); /* enable caches CD = 0 and NW = 0 */ 36345405Smsmith load_cr4(cr4save); /* restore cr4 */ 36445405Smsmith} 36545405Smsmith 36645405Smsmith/* 36745405Smsmith * Hunt for the fixed MTRR referencing (addr) 36845405Smsmith */ 36945405Smsmithstatic struct mem_range_desc * 37045405Smsmithi686_mtrrfixsearch(struct mem_range_softc *sc, u_int64_t addr) 37145405Smsmith{ 37245405Smsmith struct mem_range_desc *mrd; 37345405Smsmith int i; 37445405Smsmith 37545405Smsmith for (i = 0, mrd = sc->mr_desc; i < (MTRR_N64K + MTRR_N16K + MTRR_N4K); i++, mrd++) 37645405Smsmith if ((addr >= mrd->mr_base) && (addr < (mrd->mr_base + mrd->mr_len))) 37745405Smsmith return(mrd); 37845405Smsmith return(NULL); 37945405Smsmith} 38045405Smsmith 38145405Smsmith/* 38245405Smsmith * Try to satisfy the given range request by manipulating the fixed MTRRs that 38345405Smsmith * cover low memory. 38445405Smsmith * 38545405Smsmith * Note that we try to be generous here; we'll bloat the range out to the 38645405Smsmith * next higher/lower boundary to avoid the consumer having to know too much 38745405Smsmith * about the mechanisms here. 38845405Smsmith * 38945405Smsmith * XXX note that this will have to be updated when we start supporting "busy" ranges. 39045405Smsmith */ 39145405Smsmithstatic int 39245405Smsmithi686_mrsetlow(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) 39345405Smsmith{ 39445405Smsmith struct mem_range_desc *first_md, *last_md, *curr_md; 39545405Smsmith 39645405Smsmith /* range check */ 39745405Smsmith if (((first_md = i686_mtrrfixsearch(sc, mrd->mr_base)) == NULL) || 39845405Smsmith ((last_md = i686_mtrrfixsearch(sc, mrd->mr_base + mrd->mr_len - 1)) == NULL)) 39945405Smsmith return(EINVAL); 40045405Smsmith 401103346Sdwmalone /* check we aren't doing something risky */ 402103346Sdwmalone if (!(mrd->mr_flags & MDF_FORCE)) 403103346Sdwmalone for (curr_md = first_md; curr_md <= last_md; curr_md++) { 404103346Sdwmalone if ((curr_md->mr_flags & MDF_ATTRMASK) == MDF_UNKNOWN) 405103346Sdwmalone return (EACCES); 406103346Sdwmalone } 407103346Sdwmalone 40845405Smsmith /* set flags, clear set-by-firmware flag */ 40945405Smsmith for (curr_md = first_md; curr_md <= last_md; curr_md++) { 41045405Smsmith curr_md->mr_flags = mrcopyflags(curr_md->mr_flags & ~MDF_FIRMWARE, mrd->mr_flags); 41145405Smsmith bcopy(mrd->mr_owner, curr_md->mr_owner, sizeof(mrd->mr_owner)); 41245405Smsmith } 41345405Smsmith 41445405Smsmith return(0); 41545405Smsmith} 41645405Smsmith 41745405Smsmith 41845405Smsmith/* 41945405Smsmith * Modify/add a variable MTRR to satisfy the request. 42045405Smsmith * 42145405Smsmith * XXX needs to be updated to properly support "busy" ranges. 42245405Smsmith */ 42345405Smsmithstatic int 42445405Smsmithi686_mrsetvariable(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) 42545405Smsmith{ 42645405Smsmith struct mem_range_desc *curr_md, *free_md; 42745405Smsmith int i; 42845405Smsmith 42945405Smsmith /* 43045405Smsmith * Scan the currently active variable descriptors, look for 43145405Smsmith * one we exactly match (straight takeover) and for possible 43245405Smsmith * accidental overlaps. 43345405Smsmith * Keep track of the first empty variable descriptor in case we 43445405Smsmith * can't perform a takeover. 43545405Smsmith */ 43645405Smsmith i = (sc->mr_cap & MR686_FIXMTRR) ? MTRR_N64K + MTRR_N16K + MTRR_N4K : 0; 43745405Smsmith curr_md = sc->mr_desc + i; 43845405Smsmith free_md = NULL; 43945405Smsmith for (; i < sc->mr_ndesc; i++, curr_md++) { 44045405Smsmith if (curr_md->mr_flags & MDF_ACTIVE) { 44145405Smsmith /* exact match? */ 44245405Smsmith if ((curr_md->mr_base == mrd->mr_base) && 44345405Smsmith (curr_md->mr_len == mrd->mr_len)) { 44445405Smsmith /* whoops, owned by someone */ 44545405Smsmith if (curr_md->mr_flags & MDF_BUSY) 44645405Smsmith return(EBUSY); 447103346Sdwmalone /* check we aren't doing something risky */ 448103346Sdwmalone if (!(mrd->mr_flags & MDF_FORCE) && 449103346Sdwmalone ((curr_md->mr_flags & MDF_ATTRMASK) == MDF_UNKNOWN)) 450103346Sdwmalone return (EACCES); 45145405Smsmith /* Ok, just hijack this entry */ 45245405Smsmith free_md = curr_md; 45345405Smsmith break; 45445405Smsmith } 45548925Smsmith /* non-exact overlap ? */ 45648925Smsmith if (mroverlap(curr_md, mrd)) { 45748925Smsmith /* between conflicting region types? */ 45894683Sdwmalone if (i686_mtrrconflict(curr_md->mr_flags, mrd->mr_flags)) 45948925Smsmith return(EINVAL); 46048925Smsmith } 46145405Smsmith } else if (free_md == NULL) { 46245405Smsmith free_md = curr_md; 46345405Smsmith } 46445405Smsmith } 46545405Smsmith /* got somewhere to put it? */ 46645405Smsmith if (free_md == NULL) 46745405Smsmith return(ENOSPC); 46845405Smsmith 46945405Smsmith /* Set up new descriptor */ 47045405Smsmith free_md->mr_base = mrd->mr_base; 47145405Smsmith free_md->mr_len = mrd->mr_len; 47245405Smsmith free_md->mr_flags = mrcopyflags(MDF_ACTIVE, mrd->mr_flags); 47345405Smsmith bcopy(mrd->mr_owner, free_md->mr_owner, sizeof(mrd->mr_owner)); 47445405Smsmith return(0); 47545405Smsmith} 47645405Smsmith 47745405Smsmith/* 47845405Smsmith * Handle requests to set memory range attributes by manipulating MTRRs. 47945405Smsmith * 48045405Smsmith */ 48145405Smsmithstatic int 48245405Smsmithi686_mrset(struct mem_range_softc *sc, struct mem_range_desc *mrd, int *arg) 48345405Smsmith{ 48445405Smsmith struct mem_range_desc *targ; 48545405Smsmith int error = 0; 48645405Smsmith 48745405Smsmith switch(*arg) { 48845405Smsmith case MEMRANGE_SET_UPDATE: 48945405Smsmith /* make sure that what's being asked for is even possible at all */ 49045405Smsmith if (!mrvalid(mrd->mr_base, mrd->mr_len) || 49194683Sdwmalone i686_mtrrtype(mrd->mr_flags) == -1) 49245405Smsmith return(EINVAL); 49345405Smsmith 49445405Smsmith#define FIXTOP ((MTRR_N64K * 0x10000) + (MTRR_N16K * 0x4000) + (MTRR_N4K * 0x1000)) 49545405Smsmith 49645405Smsmith /* are the "low memory" conditions applicable? */ 49745405Smsmith if ((sc->mr_cap & MR686_FIXMTRR) && 49845405Smsmith ((mrd->mr_base + mrd->mr_len) <= FIXTOP)) { 49945405Smsmith if ((error = i686_mrsetlow(sc, mrd, arg)) != 0) 50045405Smsmith return(error); 50145405Smsmith } else { 50245405Smsmith /* it's time to play with variable MTRRs */ 50345405Smsmith if ((error = i686_mrsetvariable(sc, mrd, arg)) != 0) 50445405Smsmith return(error); 50545405Smsmith } 50645405Smsmith break; 50745405Smsmith 50845405Smsmith case MEMRANGE_SET_REMOVE: 50945405Smsmith if ((targ = mem_range_match(sc, mrd)) == NULL) 51045405Smsmith return(ENOENT); 51145405Smsmith if (targ->mr_flags & MDF_FIXACTIVE) 51245405Smsmith return(EPERM); 51345405Smsmith if (targ->mr_flags & MDF_BUSY) 51445405Smsmith return(EBUSY); 51545405Smsmith targ->mr_flags &= ~MDF_ACTIVE; 51645405Smsmith targ->mr_owner[0] = 0; 51745405Smsmith break; 51845405Smsmith 51945405Smsmith default: 52045405Smsmith return(EOPNOTSUPP); 52145405Smsmith } 52245405Smsmith 52345405Smsmith /* update the hardware */ 52448925Smsmith i686_mrstore(sc); 52545405Smsmith i686_mrfetch(sc); /* refetch to see where we're at */ 52648925Smsmith return(0); 52745405Smsmith} 52845405Smsmith 52945405Smsmith/* 53045405Smsmith * Work out how many ranges we support, initialise storage for them, 53145405Smsmith * fetch the initial settings. 53245405Smsmith */ 53345405Smsmithstatic void 53445405Smsmithi686_mrinit(struct mem_range_softc *sc) 53545405Smsmith{ 53645405Smsmith struct mem_range_desc *mrd; 53745405Smsmith int nmdesc = 0; 53845405Smsmith int i; 53945405Smsmith 54045405Smsmith mtrrcap = rdmsr(MSR_MTRRcap); 54145405Smsmith mtrrdef = rdmsr(MSR_MTRRdefType); 54245405Smsmith 54345405Smsmith /* For now, bail out if MTRRs are not enabled */ 54445405Smsmith if (!(mtrrdef & 0x800)) { 54545405Smsmith if (bootverbose) 54645405Smsmith printf("CPU supports MTRRs but not enabled\n"); 54745405Smsmith return; 54845405Smsmith } 54945405Smsmith nmdesc = mtrrcap & 0xff; 55048925Smsmith printf("Pentium Pro MTRR support enabled\n"); 55145405Smsmith 55245405Smsmith /* If fixed MTRRs supported and enabled */ 55345405Smsmith if ((mtrrcap & 0x100) && (mtrrdef & 0x400)) { 55445405Smsmith sc->mr_cap = MR686_FIXMTRR; 55545405Smsmith nmdesc += MTRR_N64K + MTRR_N16K + MTRR_N4K; 55645405Smsmith } 55745405Smsmith 55845405Smsmith sc->mr_desc = 55945405Smsmith (struct mem_range_desc *)malloc(nmdesc * sizeof(struct mem_range_desc), 56069781Sdwmalone M_MEMDESC, M_WAITOK | M_ZERO); 56145405Smsmith sc->mr_ndesc = nmdesc; 56245405Smsmith 56345405Smsmith mrd = sc->mr_desc; 56445405Smsmith 56545405Smsmith /* Populate the fixed MTRR entries' base/length */ 56645405Smsmith if (sc->mr_cap & MR686_FIXMTRR) { 56745405Smsmith for (i = 0; i < MTRR_N64K; i++, mrd++) { 56845405Smsmith mrd->mr_base = i * 0x10000; 56945405Smsmith mrd->mr_len = 0x10000; 57045405Smsmith mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; 57145405Smsmith } 57245405Smsmith for (i = 0; i < MTRR_N16K; i++, mrd++) { 57345405Smsmith mrd->mr_base = i * 0x4000 + 0x80000; 57445405Smsmith mrd->mr_len = 0x4000; 57545405Smsmith mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; 57645405Smsmith } 57745405Smsmith for (i = 0; i < MTRR_N4K; i++, mrd++) { 57845405Smsmith mrd->mr_base = i * 0x1000 + 0xc0000; 57945405Smsmith mrd->mr_len = 0x1000; 58045405Smsmith mrd->mr_flags = MDF_FIXBASE | MDF_FIXLEN | MDF_FIXACTIVE; 58145405Smsmith } 58245405Smsmith } 58345405Smsmith 58445405Smsmith /* 58545405Smsmith * Get current settings, anything set now is considered to have 58645405Smsmith * been set by the firmware. (XXX has something already played here?) 58745405Smsmith */ 58845405Smsmith i686_mrfetch(sc); 58945405Smsmith mrd = sc->mr_desc; 59045405Smsmith for (i = 0; i < sc->mr_ndesc; i++, mrd++) { 59145405Smsmith if (mrd->mr_flags & MDF_ACTIVE) 59245405Smsmith mrd->mr_flags |= MDF_FIRMWARE; 59345405Smsmith } 59445405Smsmith} 59545405Smsmith 59646215Smsmith/* 59746215Smsmith * Initialise MTRRs on an AP after the BSP has run the init code. 59846215Smsmith */ 59945405Smsmithstatic void 60046215Smsmithi686_mrAPinit(struct mem_range_softc *sc) 60146215Smsmith{ 60248925Smsmith i686_mrstoreone((void *)sc); /* set MTRRs to match BSP */ 60346215Smsmith wrmsr(MSR_MTRRdefType, mtrrdef); /* set MTRR behaviour to match BSP */ 60446215Smsmith} 60546215Smsmith 60646215Smsmithstatic void 60745405Smsmithi686_mem_drvinit(void *unused) 60845405Smsmith{ 60945405Smsmith /* Try for i686 MTRRs */ 610106842Smdodd if (!mtrrs_disabled && (cpu_feature & CPUID_MTRR) && 611103649Smdodd ((cpu_id & 0xf00) == 0x600 || (cpu_id & 0xf00) == 0xf00) && 61252177Sgreen ((strcmp(cpu_vendor, "GenuineIntel") == 0) || 61352177Sgreen (strcmp(cpu_vendor, "AuthenticAMD") == 0))) { 61445405Smsmith mem_range_softc.mr_op = &i686_mrops; 61545405Smsmith } 61645405Smsmith} 61745405Smsmith 61845405SmsmithSYSINIT(i686memdev,SI_SUB_DRIVERS,SI_ORDER_FIRST,i686_mem_drvinit,NULL) 61945405Smsmith 62045405Smsmith 621